Stop in for a cup of coffee

Do I just leave the plastic plug in there!

There was no speedometer cable connected to the old transmission
I would have to let the manual trans guys answer that. I haven't had a speedometer in any of the toy cars for last 10 years. Dad put a GPS speedometer on the column like a clamp on tach. I just don't care enough. My boy uses an app amd has his phone laying on the seat to glance at